<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert
                title="添加商品信息"
                type="info" center :closable="false"
                show-icon>
            </el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form 
                :model="addForm" 
                :rules="addFormRules" 
                ref="addFormRef" 
                label-width="100px" 
                label-position="top"
            >
                <el-tabs :tab-position="'left'" @tab-click="tabClicked" :before-leave="beforeTabLeave" v-model="activeIndex"  style="height: auto;">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_price">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="cateProps"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框 -->
                            <el-checkbox-group  v-model="item.attr_vals">
                                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- 
                            上传图片
                            action 表示图片要上传到的后台API地址
                         -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="handleSuccess"
                        >
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor
                            v-model="addForm.goods_introduce"
                        >
                        </quill-editor>
                        <!-- 添加按钮 -->
                        <el-button type="primary" @click="add" style="margin-top:20px;">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%"
        >
            <img :src="previePath" alt="" class="img">
        </el-dialog>
        
    </div>
</template>

<script>
    import _ from 'lodash'
    export default {
        data(){
            return{
                activeIndex:'0',
                // 添加商品的表单数据对象
                addForm:{
                    goods_name:'',
                    goods_price:0,
                    goods_weight:0,
                    goods_number:0,
                    // 商品所属的分类数组
                    goods_cat:[],
                    // 图片的数组
                    pics:[],
                    // 商品的详情描述
                    goods_introduce:'',
                    attrs:[]
                },
                addFormRules:{
                    goods_name:[
                        { required:true,message:'请输入商品名称',trigger:'blur'}
                    ],
                    goods_price:[
                        { required:true,message:'请输入商品价格',trigger:'blur'}
                    ],
                    goods_weight:[
                        { required:true,message:'请输入商品重量',trigger:'blur'}
                    ],
                    goods_number:[
                        { required:true,message:'请输入商品数量',trigger:'blur'}
                    ],
                    goods_cat:[
                        { required:true,message:'请选择商品分类',trigger:'blur'}
                    ]
                },
                // 商品分类列表
                catelist:[],
                cateProps:{
                    label: 'cat_name',
                    value: 'cat_id',
                    children:'children',
                    expandTrigger: 'hover' 
                },
                // 动态参数列表数据
                manyTableData:[],
                // 静态属性列表数据
                onlyTableData:[],
                // API
                uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
                // 图片上传组件的headers请求头
                headerObj:{
                    // 手动添加token
                    Authorization: window.sessionStorage.getItem('token')
                },
                previePath:'',
                previewVisible:false
            }
        },
        created(){
            this.getCateList()
        },
        methods:{
            async getCateList(){
                const {data:res} = await this.$http.get('categories')
                if(res.meta.status !== 200){
                    return this.$message.error('获取商品分类数据失败！')
                }
                this.catelist = res.data
            },
            // 级联选择器选中项变化，会触发这个函数
            handleChange(){
                if(this.addForm.goods_cat.length !== 3){
                    this.addForm.goods_cat = []
                }
            },
            // 
            beforeTabLeave(activeName,oldActiveName){
                if(oldActiveName === '0' && this.addForm.goods_cat.length !==3){
                     this.$message.error('请先选择商品分类！')
                     return false
                }
                return true
            },
            // 点击参数   获取数据
            async tabClicked(){
                // 证明访问的是动态面板
                // 2
                if(this.activeIndex === '1'){
                    const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{
                        sel:'many'
                    }})

                    if(res.meta.status !== 200){
                        return this.$message.error('获取动态参数列表失败！')
                    }
                    // res.data.attr_vals中的字符串 切割
                    res.data.forEach(item => {
                        item.attr_vals = item.attr_vals === 0 ? [] : item.attr_vals.split(' ')
                    })
                    this.manyTableData = res.data
                }else if(this.activeIndex === '2'){
                    const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{
                        sel:'only'
                    }})
                     if(res.meta.status !== 200){
                        return this.$message.error('获取动态参数列表失败！')
                    }
                    console.log(res.data)
                    this.onlyTableData = res.data
                }
            },
            // 处理图片预览效果
            handlePreview(file){
                console.log(file)
                this.previePath = file.response.data.url
                this.previewVisible = true
            },
            // 处理移除图片的操作
            handleRemove(file){
                const filePath = file.response.data.tmp_path
                const i = this.addForm.pics.findIndex(x=>{
                    x.pic === filePath
                })
                this.addForm.pics.splice(i,1)
            },
            //监听图片上传成功的事件
            handleSuccess(response){
                // 拼接得到一个图片信息对象
                const picInfo = {
                    pic:response.data.tmp_path
                }
                // 将图片信息对象，push 到数组中
                this.addForm.pics.push(picInfo)
                console.log(this.addForm)
            },
            // 添加商品
             add(){
                this.$refs.addFormRef.validate(async valid => {
                    if(!valid){
                        return this.$message.error('请填写必要的表单项')
                    }
                    // 添加的业务逻辑
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat = form.goods_cat.join(',')
                    // 处理动态参数
                    this.manyTableData.forEach(item => {
                        const newInfo = {
                            attr_id:item.attr_id,
                            attr_value:item.attr_vals.join(' ')
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    // 处理静态参数
                    this.onlyTableData.forEach(item => {
                        const newInfo = {
                            attr_id:item.attr_id,
                            attr_value:item.attr_attr_vals
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs
                    console.log(form)

                    // 发起请求
                    // 商品的名称必须是唯一的
                    const {data:res} = await this.$http.post('goods',form)
                    if(res.meta.status !== 201){
                        return this.$message.error('添加商品失败！')
                    }

                    this.$message.success('添加商品成功！')
                    this.$router.push('/goods')
                })
            }
        },
        computed:{
            cateId(){
               if( this.addForm.goods_cat.length === 3 ){
                   return this.addForm.goods_cat[2]
               }
               return null
            }
        }
    }
</script>

<style lang="less" scoped>
    .el-checkbox{
        margin: 0 5px 0 0 !important;
    }
    .img{
        width: 100%;
    }
    
</style>
